Which antivirus is the best one?

Hey Dear,
I am using Avast Antivirus version 5. Is this a good Antivirus?
I have traveled to some Antivirus's web sites and in the ESET NOD32’s site says that it is the best Antivirus in the world and when I traveled to the Avast website they say that their product is the best even when I went to the Kaspersky site they also said that they have best Antivirus product/ software in the world.
I have used almost all Antivirus and according to my observation I think that Nod, Kaspersky and Avast are top three as far as performance is concerned. Eset Nod shows some performance graph which shows/clears that it is the best but I have used Norton, Avast, Avira, AVG, Kaspersky etc. I found that ESET is the fastest one among them.
Because according to my observations it takes less time to load, compared to other Antivirus software like AVG, Kaspersky, Avast, Avira etc. And also has very simple to understand user interface. So, it can be controlled or understand by anyone easily and smoothly. Moreover, secondly I like Avast because I founded its features such as sound alerts etc very much attractive and extraordinary.
But in different advertisements as we see that Kaspersky says that they are the best. So now it is a great confusion for me that which Antivirus is the best. I have used all popular Antivirus Software's to solve this issue and as I said that I like Eset Nod the most but I am still confused.
Is ESET's website is saying the right thing or Kaspersky is saying the right thing? Which one is true or the Avast is true?
If anyone has any idea about this issue, kindly tell me. I would like to know that which one is best. I am waiting for your ideas to be delivered or conveyed to me as soon as possible.
